Automatic safety device for elevators.



J. T. DEMPSBY.

AUTOMATIC SAFETY DEVICE FOR ELEVATORS.

APPLICATION FILED 31111324, 1909.

Patented Nov. 23, 1909.

UNITED STATES PATENT OFFICE.

JAMES T. DEMPSEY, OF KANSAS CITY, KANSAS, ASSIGNOR OF ONE-HALF TO E. S. W. DROUGHT, OF KANSAS CITY, MISSOURI.

AUTOMATIC SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent. Patented NOV. 23, 1909.

Application filed. June 24, 1909. Serial No. 504,068.

To all whom it may concern:

Be it known that I, JAMES T. DEMPSEY, a citizen of the United States, residing at Kansas City, in the county of Wyandotte and State of Kansas, have invented certain new and useful Improvements in Automatic Safety Devices for Elevators, of which the following is a specification.

My invention relates to an automatic safety device for elevators, and my object is to prevent accidents arising from passengers attempting to enter or leave the elevator car while the same is in motion. I accomplish this result by providing means whereby said car is locked at a landing when the door leading thereto is thrown open, and which holds the car in a locked position until the door is closed.

In order that the invention may be fully understood, reference will now be made to the accompanying drawing, in which:

Figure 1 represents a broken front elevation, partlyin section, of an elevator landing, and a car provided with my improvements. Fig. 2 is a horizontal section on line II II of Fig. 1. Fig. 3 is an enlarged cross section on line IIIIII of Fig. 2. Fig. 4 is an irregular horizontal section on line IVIV of Fig. 3, showing the lock in an operative position.

1 designates the fioor of the landing.

2 designates the customary grille at the landing for inclosing the elevator shaft 3.

a designates the door leading from the landing to the elevator car 5, and which is slidably mounted in the customary manner. Car 5 is provided at one corner with an exterior metallic plate 6 provided at its lower portion with a pocket 7. w

8 designates a cam pivotally-mounted in a guide 9 secured to floor 1. Cam '8 has a curved face 10, and an extension 11, which latter is located at the rear end of the cam and extends substantially at right angles thereto.

12 designates a cam-actuating device secured to the rear side of door 4, and provided with a curved face 13 adapted to engage the curved face of the cam, and a transverse face 14 extending substantially at right the door is thrown open, the curved face 13' of the actuating device engages the curved face 10 of the cam and throws the free end of the latter into the pocket, as shown in full lines in Fig. 4 and by dotted lines in Fig. 2, thereby locking the car while the door remains in an open position. \Vhen the free end of the cam is thrown into pocket 7, extension 11 is swung around into the path of face '14: of the actuating device, so that when the door is closed, said face will engage the extension and swing the cam back to its inoperative position, thereby releasing the car so that the same may ascend or descend.

Pocket 7 is preferably made much deeper than the thickness of cam 8, so that the latter may enter the former even though the car is not stopped at the exact point each time.

Plate 6 is provided chiefly to protect the exterior finish of the car from becoming marred by the cam being thrown against the same should the operator attempt to open door 4 before pocket 7 registers with the cam.

Having thus described my invention, what I claim is 1. In combination, an elevator car provided with a pocket, a door for controlling the entrance to said car, a cam pivotallymounted at the elevator landing for entering said pocket to lock the car, said cam having a curved face and an extension, and a device carried by the elevator door adapted to engage the curved face of the cam to throw the latter into the pocket when the door is opened, and engage the extension on the cam to throw the latter out of the pocket when the door is closed.

2. In combination, an elevator car, a door for controlling the entrance to said car, a cam pivotally-mounted at the elevator landing and provided with a curved or beveled face and an extension, and a cam-actuating device secured to the elevator door and embodying a curved or beveled face adapted to engage the curved or beveled face of the In testimony whereof I aflix my signature, cam to throw the latter into engagement in the presence of two Witnesses. with the car to lock the same when the door is opened, and a transverse face adapted to JAMES DEMPSEY' engage the extension on the cam to disen- Htnesses:

gage the same from the car when the door F. Gr. FISCHER, is closed. M. Cox. 

